[dredmorbius]

Runners use Body Glide, among others, particularly for chafing thighs: https://www.runnersworld.com/gear/g37340104/best-anti-chafin...

I'm not sure what else would work for feet and toes, though asking on a running / distance-walking discussion would probably be useful. A chief problem is adding something else that irritates skin at the same time you're trying to reduce the problem.

Cyclists tend to swear by bag balm: https://www.rivbike.com/pages/saddle-sores

Ocean rowers and open-water swimmers also use various treatments against friction and salt rashes, though I'm not sure which specifically.